Is there any way I can make a curve and/or a mesh from a wavefile?
I've done this myself in the past, but the way I did it was fairly indirect. I loaded the file into Audacity, and took a screenshot of the audio visualization. Then I opened that file in Inkscape and cropped the screenshot to just the part of the audio that I wanted. I traced the image and saved the file as an SVG. I then imported this SVG into blender. Here's what that looked like when finished.


If you need help with the intermediary steps, let me know. None of the steps are overly difficult, but using an unfamiliar program can always be a challenge. :)